Watch Serena Williams sing 'Under the Sea' at karaoke

During a karaoke night sponsored by Delta Air Lines ahead of the U.S. Open, the tennis star chose to sing “Under the Sea” from The Little Mermaid — albeit without a hot crustacean band, but with the original dance moves. She told the AP she wanted to kick back before the tournament begins Aug. 31, when she’ll be vying for her fifth straight major title, as well as a calendar Grand Slam.

“We just kind of wanted to celebrate just kicking off [the] U.S. Open and having fun and relaxing and enjoying it,” she said. “I always get so nervous every year like, ‘I don’t know what to do, I don’t know what to do.'”